7c4c4b9987
If the module is enabled (default), 2D physics works as it did before. If the module is disabled and no other 2D physics server is registered (via a module or GDExtension), then we fall back to a dummy implementation which effectively disables 2D physics functionality (and a warning is printed). The dummy 2D physics server can also be selected explicitly, in which case no warning is printed.
274 lines
11 KiB
C++
274 lines
11 KiB
C++
/**************************************************************************/
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/* godot_collision_solver_2d.cpp */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#include "godot_collision_solver_2d.h"
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#include "godot_collision_solver_2d_sat.h"
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#define collision_solver sat_2d_calculate_penetration
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//#define collision_solver gjk_epa_calculate_penetration
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bool GodotCollisionSolver2D::solve_static_world_boundary(const GodotShape2D *p_shape_A, const Transform2D &p_transform_A, const GodotShape2D *p_shape_B, const Transform2D &p_transform_B, const Vector2 &p_motion_B, CallbackResult p_result_callback, void *p_userdata, bool p_swap_result, real_t p_margin) {
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const GodotWorldBoundaryShape2D *world_boundary = static_cast<const GodotWorldBoundaryShape2D *>(p_shape_A);
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if (p_shape_B->get_type() == PhysicsServer2D::SHAPE_WORLD_BOUNDARY) {
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return false;
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}
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Vector2 n = p_transform_A.basis_xform(world_boundary->get_normal()).normalized();
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Vector2 p = p_transform_A.xform(world_boundary->get_normal() * world_boundary->get_d());
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real_t d = n.dot(p);
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Vector2 supports[2];
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int support_count;
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p_shape_B->get_supports(p_transform_B.affine_inverse().basis_xform(-n).normalized(), supports, support_count);
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bool found = false;
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for (int i = 0; i < support_count; i++) {
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supports[i] += p_margin * supports[i].normalized();
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supports[i] = p_transform_B.xform(supports[i]);
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supports[i] += p_motion_B;
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real_t pd = n.dot(supports[i]);
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if (pd >= d) {
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continue;
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}
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found = true;
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Vector2 support_A = supports[i] - n * (pd - d);
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if (p_result_callback) {
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if (p_swap_result) {
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p_result_callback(supports[i], support_A, p_userdata);
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} else {
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p_result_callback(support_A, supports[i], p_userdata);
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}
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}
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}
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return found;
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}
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bool GodotCollisionSolver2D::solve_separation_ray(const GodotShape2D *p_shape_A, const Vector2 &p_motion_A, const Transform2D &p_transform_A, const GodotShape2D *p_shape_B, const Transform2D &p_transform_B, CallbackResult p_result_callback, void *p_userdata, bool p_swap_result, Vector2 *r_sep_axis, real_t p_margin) {
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const GodotSeparationRayShape2D *ray = static_cast<const GodotSeparationRayShape2D *>(p_shape_A);
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if (p_shape_B->get_type() == PhysicsServer2D::SHAPE_SEPARATION_RAY) {
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return false;
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}
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Vector2 from = p_transform_A.get_origin();
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Vector2 to = from + p_transform_A[1] * (ray->get_length() + p_margin);
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if (p_motion_A != Vector2()) {
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//not the best but should be enough
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Vector2 normal = (to - from).normalized();
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to += normal * MAX(0.0, normal.dot(p_motion_A));
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}
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Vector2 support_A = to;
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Transform2D invb = p_transform_B.affine_inverse();
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from = invb.xform(from);
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to = invb.xform(to);
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Vector2 p, n;
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if (!p_shape_B->intersect_segment(from, to, p, n)) {
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if (r_sep_axis) {
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*r_sep_axis = p_transform_A[1].normalized();
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}
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return false;
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}
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// Discard contacts when the ray is fully contained inside the shape.
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if (n == Vector2()) {
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if (r_sep_axis) {
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*r_sep_axis = p_transform_A[1].normalized();
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}
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return false;
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}
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// Discard contacts in the wrong direction.
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if (n.dot(from - to) < CMP_EPSILON) {
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if (r_sep_axis) {
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*r_sep_axis = p_transform_A[1].normalized();
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}
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return false;
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}
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Vector2 support_B = p_transform_B.xform(p);
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if (ray->get_slide_on_slope()) {
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Vector2 global_n = invb.basis_xform_inv(n).normalized();
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support_B = support_A + (support_B - support_A).length() * global_n;
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}
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if (p_result_callback) {
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if (p_swap_result) {
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p_result_callback(support_B, support_A, p_userdata);
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} else {
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p_result_callback(support_A, support_B, p_userdata);
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}
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}
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return true;
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}
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struct _ConcaveCollisionInfo2D {
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const Transform2D *transform_A = nullptr;
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const GodotShape2D *shape_A = nullptr;
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const Transform2D *transform_B = nullptr;
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Vector2 motion_A;
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Vector2 motion_B;
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real_t margin_A = 0.0;
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real_t margin_B = 0.0;
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GodotCollisionSolver2D::CallbackResult result_callback = nullptr;
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void *userdata = nullptr;
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bool swap_result = false;
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bool collided = false;
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int aabb_tests = 0;
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int collisions = 0;
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Vector2 *sep_axis = nullptr;
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};
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bool GodotCollisionSolver2D::concave_callback(void *p_userdata, GodotShape2D *p_convex) {
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_ConcaveCollisionInfo2D &cinfo = *(static_cast<_ConcaveCollisionInfo2D *>(p_userdata));
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cinfo.aabb_tests++;
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bool collided = collision_solver(cinfo.shape_A, *cinfo.transform_A, cinfo.motion_A, p_convex, *cinfo.transform_B, cinfo.motion_B, cinfo.result_callback, cinfo.userdata, cinfo.swap_result, cinfo.sep_axis, cinfo.margin_A, cinfo.margin_B);
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if (!collided) {
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return false;
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}
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cinfo.collided = true;
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cinfo.collisions++;
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// Stop at first collision if contacts are not needed.
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return !cinfo.result_callback;
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}
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bool GodotCollisionSolver2D::solve_concave(const GodotShape2D *p_shape_A, const Transform2D &p_transform_A, const Vector2 &p_motion_A, const GodotShape2D *p_shape_B, const Transform2D &p_transform_B, const Vector2 &p_motion_B, CallbackResult p_result_callback, void *p_userdata, bool p_swap_result, Vector2 *r_sep_axis, real_t p_margin_A, real_t p_margin_B) {
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const GodotConcaveShape2D *concave_B = static_cast<const GodotConcaveShape2D *>(p_shape_B);
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_ConcaveCollisionInfo2D cinfo;
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cinfo.transform_A = &p_transform_A;
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cinfo.shape_A = p_shape_A;
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cinfo.transform_B = &p_transform_B;
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cinfo.motion_A = p_motion_A;
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cinfo.result_callback = p_result_callback;
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cinfo.userdata = p_userdata;
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cinfo.swap_result = p_swap_result;
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cinfo.collided = false;
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cinfo.collisions = 0;
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cinfo.sep_axis = r_sep_axis;
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cinfo.margin_A = p_margin_A;
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cinfo.margin_B = p_margin_B;
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cinfo.aabb_tests = 0;
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Transform2D rel_transform = p_transform_A;
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rel_transform.columns[2] -= p_transform_B.get_origin();
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// Quickly compute a local Rect2.
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Rect2 local_aabb;
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for (int i = 0; i < 2; i++) {
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Vector2 axis(p_transform_B.columns[i]);
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real_t axis_scale = 1.0 / axis.length();
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axis *= axis_scale;
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real_t smin = 0.0, smax = 0.0;
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p_shape_A->project_rangev(axis, rel_transform, smin, smax);
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smin *= axis_scale;
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smax *= axis_scale;
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local_aabb.position[i] = smin;
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local_aabb.size[i] = smax - smin;
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}
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// In case of motion, expand the Rect2 in the motion direction.
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if (p_motion_A != Vector2()) {
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Rect2 moved_aabb = local_aabb;
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moved_aabb.position += p_motion_A;
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local_aabb = local_aabb.merge(moved_aabb);
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}
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concave_B->cull(local_aabb, concave_callback, &cinfo);
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return cinfo.collided;
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}
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bool GodotCollisionSolver2D::solve(const GodotShape2D *p_shape_A, const Transform2D &p_transform_A, const Vector2 &p_motion_A, const GodotShape2D *p_shape_B, const Transform2D &p_transform_B, const Vector2 &p_motion_B, CallbackResult p_result_callback, void *p_userdata, Vector2 *r_sep_axis, real_t p_margin_A, real_t p_margin_B) {
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PhysicsServer2D::ShapeType type_A = p_shape_A->get_type();
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PhysicsServer2D::ShapeType type_B = p_shape_B->get_type();
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bool concave_A = p_shape_A->is_concave();
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bool concave_B = p_shape_B->is_concave();
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real_t margin_A = p_margin_A, margin_B = p_margin_B;
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bool swap = false;
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if (type_A > type_B) {
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SWAP(type_A, type_B);
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SWAP(concave_A, concave_B);
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SWAP(margin_A, margin_B);
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swap = true;
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}
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if (type_A == PhysicsServer2D::SHAPE_WORLD_BOUNDARY) {
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if (type_B == PhysicsServer2D::SHAPE_WORLD_BOUNDARY) {
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WARN_PRINT_ONCE("Collisions between world boundaries are not supported.");
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return false;
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}
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if (swap) {
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return solve_static_world_boundary(p_shape_B, p_transform_B, p_shape_A, p_transform_A, p_motion_A, p_result_callback, p_userdata, true, p_margin_A);
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} else {
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return solve_static_world_boundary(p_shape_A, p_transform_A, p_shape_B, p_transform_B, p_motion_B, p_result_callback, p_userdata, false, p_margin_B);
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}
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} else if (type_A == PhysicsServer2D::SHAPE_SEPARATION_RAY) {
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if (type_B == PhysicsServer2D::SHAPE_SEPARATION_RAY) {
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WARN_PRINT_ONCE("Collisions between two rays are not supported.");
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return false; //no ray-ray
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}
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if (swap) {
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return solve_separation_ray(p_shape_B, p_motion_B, p_transform_B, p_shape_A, p_transform_A, p_result_callback, p_userdata, true, r_sep_axis, p_margin_B);
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} else {
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return solve_separation_ray(p_shape_A, p_motion_A, p_transform_A, p_shape_B, p_transform_B, p_result_callback, p_userdata, false, r_sep_axis, p_margin_A);
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}
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} else if (concave_B) {
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if (concave_A) {
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WARN_PRINT_ONCE("Collisions between two concave shapes are not supported.");
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return false;
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}
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if (!swap) {
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return solve_concave(p_shape_A, p_transform_A, p_motion_A, p_shape_B, p_transform_B, p_motion_B, p_result_callback, p_userdata, false, r_sep_axis, margin_A, margin_B);
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} else {
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return solve_concave(p_shape_B, p_transform_B, p_motion_B, p_shape_A, p_transform_A, p_motion_A, p_result_callback, p_userdata, true, r_sep_axis, margin_A, margin_B);
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}
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} else {
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return collision_solver(p_shape_A, p_transform_A, p_motion_A, p_shape_B, p_transform_B, p_motion_B, p_result_callback, p_userdata, false, r_sep_axis, margin_A, margin_B);
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}
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}
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